cmake_minimum_required(VERSION 3.10)

# set the project name
project(Tutorial VERSION 1.0)

option(USE_MYMATH "Use tutorial provided math implementation" ON)

# configure a header file to pass some of the CMake settings
# to the source code
configure_file(TutorialConfig.h.in TutorialConfig.h)

if(USE_MYMATH)
    add_subdirectory(MathFunctions)
    list(APPEND EXTRA_LIBS MathFunctions)
endif()

# add the executable
add_executable(Tutorial tutorial.cxx)

target_link_libraries(Tutorial PUBLIC ${EXTRA_LIBS})

# add the binary tree to the search path for include files
# so that we will find TutorialConfig.h
target_include_directories(Tutorial PUBLIC
        "${PROJECT_BINARY_DIR}"
        )

# specify the C++ standard
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED True)

install(TARGETS Tutorial DESTINATION bin)
install(FILES "${PROJECT_BINARY_DIR}/TutorialConfig.h"
        DESTINATION include
        )

# enable tests
enable_testing()

# does the application run
add_test(NAME Runs COMMAND Tutorial 25)

# does the usage message work?
add_test(NAME Usage COMMAND Tutorial)
set_tests_properties(Usage
        PROPERTIES PASS_REGULAR_EXPRESSION "Usage:.*number"
        )

# define a function to simplify adding tests
function(do_test target arg result)
    add_test(NAME Comp${arg} COMMAND ${target} ${arg})
    set_tests_properties(Comp${arg}
            PROPERTIES PASS_REGULAR_EXPRESSION ${result}
            )
endfunction()

# do a bunch of result based tests
do_test(Tutorial 4 "4 is 2")
do_test(Tutorial 9 "9 is 3")
do_test(Tutorial 5 "5 is 2.236")
do_test(Tutorial 7 "7 is 2.645")
do_test(Tutorial 25 "25 is 5")
do_test(Tutorial -25 "-25 is (-nan|nan|0)")
do_test(Tutorial 0.0001 "0.0001 is 0.01")

# the process on how to build the module
# 1
# cd xx/Step4/v1/build/
# cmake ../../v1/  or cmake ../../v1/ -DUSE_MYMATH=OFF
# cmake --build . and cmake --install . --prefix "/Users/didi/CLionProjects/others/c++ptn/D1CmakeOfficialTutorial/Step4/v1/include"
# Tutorial 9
# Tutorial 16
# Tutorial
# ctest
# ctest -VV
# ctest -C Debug -VV
# ctest -C Release